Designation: F 436 – 93 (Reapproved 2000)

Standard Specification forHardened Steel Washers 1

This standard is issued under the fixed designation F 436; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 This specification covers the chemical, mechanical, anddimensional requirements for hardened steel washers for usewith fasteners having nominal thread diameters of1⁄4 through 4in. These washers are intended for general-purpose mechanicaland structural use with bolts, nuts, studs, and other internallyand externally threaded fasteners. These washers are suitablefor use with fasteners covered in Specifications A 325, A 354,A 449, A 490, and A 687.

1.2 The washers are designated bytypedenoting the mate-rial and bystyledenoting the shape.

1.2.1 The types of washers covered are:1.2.1.1 Type 1—Carbon steel.1.2.1.2 Type 3—Weathering steel. Atmospheric corrosion

resistance and weathering characteristics are comparable tothat of steels covered in Specifications A 588/A 588M andA 709/A 709M. The atmospheric corrosion resistance of thesesteels is substantially better than that of carbon steel with orwithout copper addition. See 5.1. When properly exposed tothe atmosphere, these steels can be used bare (uncoated) formany applications.

1.2.2 The styles of washers covered are:1.2.2.1 Circular—Circular washers in nominal bolt sizes1⁄4

through 4 in. suitable for applications where sufficient spaceexists and angularity permits.

1.2.2.2 Beveled—Beveled washers are square or rectangu-lar, in nominal sizes1⁄2 through 11⁄2 in., with a beveled 1 to 6ratio surface for use with American standard beams andchannels.

1.2.2.3 Clipped—Clipped washers are circular or beveledfor use where space limitations necessitate that one side beclipped.

NOTE 1—A complete metric companion to Specification F 436 has beendeveloped—Specification F 436M; therefore no metric equivalents arepresented in this specification.

2. Referenced Documents

2.1 ASTM Standards:

A 153 Specification for Zinc Coating (Hot-Dip) on Iron andSteel Hardware2

A 325 Specification for Structural Bolts, Steel, HeatTreated, 120/105 ksi Minimum Tensile Strength3

A 354 Specification for Quenched and Tempered AlloySteel Bolts, Studs, and Other Externally Threaded Fasten-ers3

A 449 Specification for Quenched and Tempered SteelBolts and Studs3

A 490 Specification for Heat-Treated Steel Structural Bolts,150 ksi Minimum Tensile Strength3

A 588/A 588M Specification for High-Strength Low-AlloyStructural Steel with 50 ksi [345 MPa] Minimum YieldPoint to 4 in. [100 mm] Thick4

A 687 Specification for High-Strength Nonheaded SteelBolts and Studs3

A 709/A 709M Specification for Structural Steel forBridges4

A 751 Test Methods, Practices, and Terminology forChemical Analysis of Steel Products5

B 695 Specification for Coatings of Zinc MechanicallyDeposited on Iron and Steel6

D 3951 Practice for Commercial Packaging7

F 606 Test Methods for Determining the Mechanical Prop-erties of Externally and Internally Threaded Fasteners,Washers, and Rivets3

G 101 Guide for Estimating the Atmospheric CorrosionResistance of Low-Alloy Steels8

3. Ordering Information

3.1 Orders for hardened steel washers under this specifica-tion shall include the following:

3.1.1 ASTM designation and year of issue,3.1.2 Quantity (number of pieces by size),3.1.3 Type and Style (see 1.2.1 and 1.2.2),3.1.4 Zinc Coating—Specify the zinc coating process re-

quired, for example, hot-dip, mechanically deposited, or nopreference (see 4.3),

3.1.5 Dimensions, nominal size, and other dimensions, if

1 This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.02 on Steel Bolts,Nuts, Rivets, and Washers.

Current edition approved May 10, 2000. Published August 2000. Originallypublished as F 436 – 76. Last previous edition F 436 – 93.

2 Annual Book of ASTM Standards, Vol 01.06.3 Annual Book of ASTM Standards, Vol 01.08.4 Annual Book of ASTM Standards, Vol 01.04.5 Annual Book of ASTM Standards, Vol 01.03.6 Annual Book of ASTM Standards, Vol 02.05.7 Annual Book of ASTM Standards, Vol. 15.09.8 Annual Book of ASTM Standards, Vol 03.02.

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Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.

modified from those covered in this specification,3.1.6 Specify if inspection at point of manufacture is re-

quired,3.1.7 Specify if manufacturer’s certification or test reports,

or both, are required, and3.1.8 Special requirements.

4. Materials and Manufacture

4.1 Steel used in the manufacture of washers shall beproduced by the open-hearth, basic-oxygen, or electric-furnaceprocess.

4.2 Washers up to and including 11⁄2 in. in bolt size shall bethrough hardened. Washers over 11⁄2 in. may be either throughhardened or carburized at the option of the manufacturer.

4.3 Zinc Coatings, Hot-Dip and Mechanically Deposited:4.3.1 When zinc-coated washers are required, the purchaser

shall specify the zinc coating process, for example, hot-dip,mechanically deposited, or no preference.

4.3.2 When hot-dip is specified the washers shall be zinccoated by the hot-dip process in accordance with the require-ments of Class C of Specification A 153.

4.3.3 When mechanically deposited is specified the washersshall be zinc coated by the mechanical-deposition process inaccordance with the requirements of Class 50 of SpecificationB 695.

4.3.4 When no preference is specified, the supplier mayfurnish either a hot-dip zinc coating in accordance withSpecification A 153, Class C, or a mechanically deposited zinccoating in accordance with Specification B 695, Class 50.Threaded components (bolt and nuts) shall be coated by thesame zinc-coating process and the supplier’s option is limitedto one process per item with no mixed processes in a lot.

4.4 If washers are heat treated by a subcontractor, they shallbe returned to the manufacturer for testing prior to shipment tothe purchaser.

5. Chemical Composition

5.1 Type 1 and Type 3 washers shall conform to thechemical composition specified in Table 1. For Type 3 seeGuide G 101 for methods of estimating corrosion resistance oflow alloy steels.

5.2 Product analysis may be made by the purchaser fromfinished material representing each lot of washers. The chemi-cal composition shall conform to the requirements of 4.1 and5.1.

5.3 Individual heats of steel are not identified in the finishedproduct.

5.4 Chemical analyses shall be performed in accordancewith Test Methods, Practices, and Terminology A 751.

6. Mechanical Properties

6.1 Through hardened washers shall have a hardness of 38to 45 HRC, except when zinc-coated by the hot-dip process, inwhich case they shall have a hardness of 26 to 45 HRC.

6.2 Carburized washers shall be carburized to a minimumdepth of 0.015 in. and shall have a surface hardness of 69 to 73HRA or 79 to 83 HR15N, except when zinc-coated by thehot-dip process, in which case they shall have a hardness of 63to 73 HRA or 73 to 83 HR15N.

6.3 Carburized and hardened washers shall have a minimumcore hardness of 30 HRC or 65 HRA.

7. Dimensions and Tolerances

7.1 All circular and clipped circular washers shall conformto the dimensions shown in Table 2 and Table 3.

7.2 All square beveled and clipped square beveled washersshall conform to the dimensions shown in Table 3 and Table 4.In addition, rectangular beveled and clipped rectangular bev-eled washers shall conform to the dimensions shown in Table3 and Table 4, except that one side may be longer than shownfor the “A” dimension.

7.3 Unless otherwise stated in the inquiry or purchase order,plain (uncoated) hardened steel circular washers shall befurnished. Where corrosion-preventive treatment is required,washers shall be coated as agreed upon between the manufac-turer and the purchaser.

8. Workmanship, Finish, and Appearance

8.1 Washers shall be free of excess mill scale, excesscoatings and foreign material on bearing surfaces. Arc and gascut washers shall be free of metal spatter.

9. Sampling and Number of Tests

9.1 The requirements of this specification shall be met incontinuous mass production for stock, and the manufacturershall make sample inspections to ensure that the productconforms to the specified requirements. Additional tests ofindividual shipments of material are not ordinarily contem-plated.

9.2 When additional tests are specified in the inquiry orpurchase order, a lot, for purposes of selecting test samples,shall consist of all material offered for inspection at one timethat has the following common characteristics:

9.2.1 Same nominal size.9.2.2 Same material grade.9.2.3 Same nominal post treatment (heat treatment or coat-

ing or both).

TABLE 1 Chemical Requirements

Element

Composition, %

Type 1 Type 3A

Phosphorus, maxHeat analysisProduct analysis

0.0400.050

0.0400.045

Sulfur, maxHeat analysisProduct analysis

0.0500.060

0.0500.055

SiliconHeat analysisProduct analysis

...

...0.15–0.350.13–0.37

ChromiumHeat analysisProduct analysis

...

...0.45–0.650.42–0.68

NickelHeat analysisProduct analysis

...

...0.25–0.450.22–0.48

CopperHeat analysisProduct analysis

...

...0.25–0.450.22–0.48

A Weathering steel washers may also be manufactured from any of the steelslisted in Table 2 of Specification A 325.

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9.3 From each lot described in 9.2, the number of specimenstested for each required property shall be as follows:

Number of Pieces in Lot Number of Specimens

800 and under 1801 to 8000 28001 to 22 000 3Over 22 000 5

10. Test Methods

10.1 Hardness:

10.1.1 Non-carburized Washers—A minimum of two read-ings shall be taken 180° apart on at least one face at a minimumdepth of 0.015 in.

10.1.2 Carburized Washers—A minimum of two readingsshall be taken 180° apart on at least one face.

10.2 Hardness tests shall be performed in accordance withthe Rockwell test method specified in Test Methods F 606.

TABLE 2 Hardened Circular and Clipped Circular Washers

NOTE 1—Tolerances are as noted in table on washer dimension tolerances.

Circular Clipped Circular

BoltSize

Circular and Clipped Circular Clipped

NominalOutside

Diameter(OD),

in.

NominalInside

Diameter(ID),

in.

Thickness (T), in.

MinimumEdge

Distance(E)A,

in.min max

1⁄4 5⁄8 9⁄32 0.051 0.080 7⁄32

5⁄16 11⁄16 11⁄32 0.051 0.080 9⁄32

3⁄8 13⁄16 13⁄32 0.051 0.080 11⁄32

7⁄16 59⁄64 15⁄32 0.051 0.080 13⁄32

1⁄2 11⁄16 17⁄32 0.097 0.177 7⁄16

5⁄8 15⁄16 11⁄16 0.122 0.177 9⁄16

3⁄4 115⁄32 13⁄16 0.122 0.177 21⁄32

7⁄8 13⁄4 15⁄16 0.136 0.177 25⁄32

1 2 11⁄8 0.136 0.177 7⁄811⁄8 21⁄4 11⁄4 0.136 0.177 111⁄4 21⁄2 13⁄8 0.136 0.177 13⁄32

13⁄8 23⁄4 11⁄2 0.136 0.177 17⁄32

11⁄2 3 15⁄8 0.136 0.177 15⁄16

13⁄4 33⁄8 17⁄8 0.178B 0.28B 117⁄32

2 33⁄4 21⁄8 0.178B 0.28B 13⁄421⁄4 4 23⁄8 0.24C 0.34C 221⁄2 41⁄2 25⁄8 0.24C 0.34C 23⁄16

23⁄4 5 27⁄8 0.24C 0.34C 213⁄32

3 51⁄2 31⁄8 0.24C 0.34C 25⁄831⁄4 6 33⁄8 0.24C 0.34C 27⁄831⁄2 61⁄2 35⁄8 0.24C 0.34C 31⁄16

33⁄4 7 37⁄8 0.24C 0.34C 35⁄16

4 71⁄2 41⁄8 0.24C 0.34C 31⁄2

A Clipped edge E shall be not closer than 7⁄8of the bolt diameter from the center of the washer.B 3⁄16 in. nominal.C 1⁄4 in. nominal.

TABLE 3 Washer Dimension Tolerances

To 11⁄2 in.Nominal

Bolt Size,incl

Over11⁄2 in.

NominalBolt Size,

incl

Over3 to 4 in.Nominal

Bolt Size,incl

Nominal diameter of hole, in. −0, +1⁄32 −0, +1⁄16 −0, +1⁄8Nominal outside diameter, in. 6 1⁄32 6 1⁄16 6 1⁄8Flatness: max deviation from straightedge

placed on cut side shall not exceed (in.)0.010 0.015 0.032

Concentricity, in.: center of hole to outsidediameter

0.030 FIRA 0.090 FIRA 0.250 FIRA

Burr shall not project above immediatelyadjacent washer surface more than (in.)

0.010 0.015 0.025

A Full indicator runout.

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11. Inspection

11.1 The manufacturer shall afford the purchaser’s inspectorall reasonable facilities necessary to satisfy him that thematerial is being produced and furnished in accordance withthis specification. Mill inspection by the purchaser shall notinterfere unnecessarily with the manufacturer’s operations. Alltests and inspections shall be made at the place of manufacture,unless otherwise agreed to.

11.2 If other than the normal inspection for continuous massproduction of parts as stipulated in 9.1 is required by thepurchaser, it shall be specified in the inquiry and contract order.

12. Rejection and Rehearing

12.1 Material that fails to conform to the requirements ofthis specification may be rejected. Rejection should be reportedto the producer or supplier promptly and in writing. In case ofdissatisfaction with the results of the test, the producer orsupplier may make claim for a rehearing.

13. Certification and Test Report

13.1 Upon request of the purchaser in the contract or order,a manufacturer’s certification that the material was manufac-tured and tested in accordance with this specification, togetherwith a report of the latest mechanical tests of each stock size ineach shipment, shall be furnished at the time of shipment.

13.2 Data contained in the certified test report shall includematerial grade and hardness tests.

14. Responsibility

14.1 The party responsible for the fastener shall be the

organization that supplies the fastener to the purchaser andcertifies that the fastener was manufactured, sampled, testedand inspected in accordance with this specification and meetsall of its requirements.

15. Product Marking

15.1 Washers shall be marked with a symbol, or otherdistinguishing marks, to identify the manufacturer or privatelabel distributor, as appropriate.

15.2 Additionally, Type 3 weathering steel washers shall beidentified with the symbol “3”.

15.3 Additional identification or distinguishing marks, orboth, may be used by the manufacturer.

15.4 All marking symbols shall be depressed on one face ofthe washer.

15.5 Type and manufacturer’s or private label distributor’sidentification shall be separate and distinct. The two identifi-cations shall preferably be in different locations and, when onthe same level, shall be separated by at least two spaces.

15.6 It is possible that during the clipping of circularwashers the marking symbols may be removed. This isacceptable provided that the majority of washers in the lot stilldisplay the identification marks.

16. Packaging and Package Marking

16.1 Packaging:16.1.1 Unless otherwise specified, packaging shall be in

accordance with Practice D 3951.16.1.2 When special packaging requirements are required,

they shall be defined at the time of the inquiry and order.

TABLE 4 Hardened Beveled Washers

NOTE 1—Tolerances are as noted in Table 3.

Square Square Clipped

BoltSize,

in.

Square Beveled and Clipped Square BeveledA Clipped

MinimumSide

Dimension(A),in.

NominalInside

Diameter(I.D.),

in.

MeanThickness

(T),in.

Slopeor

Taperin

Thickness

NominalEdge

Distance(E),B

in.

1⁄2 13⁄4 17⁄32 5⁄16 1:6 7⁄16

5⁄8 13⁄4 11⁄16 5⁄16 1:6 9⁄16

3⁄4 13⁄4 13⁄16 5⁄16 1:6 21⁄32

7⁄8 13⁄4 15⁄16 5⁄16 1:6 25⁄32

1 13⁄4 11⁄8 5⁄16 1:6 7⁄811⁄8 21⁄4 11⁄4 5⁄16 1:6 111⁄4 21⁄4 13⁄8 5⁄16 1:6 13⁄32

13⁄8 21⁄4 11⁄2 5⁄16 1:6 17⁄32

11⁄2 21⁄4 15⁄8 5⁄16 1:6 15⁄16

A Rectangular beveled washers shall conform to the dimensions shown above, except that one side may be longer than that shown for the A dimension.B Clipped edge E shall not be closer than 7⁄8 of the bolt diameter from the center of the washer.

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16.2 Package Marking:16.2.1 Each shipping unit shall include or be plainly marked

with the following information:16.2.1.1 ASTM designation and type,16.2.1.2 Size,16.2.1.3 Name and brand or trademark of the manufacturer,

16.2.1.4 Number of pieces,16.2.1.5 Purchase order number, and16.2.1.6 Country of origin.

17. Keywords

17.1 carbon steel; steel; washers; weathering steel

SUPPLEMENTARY REQUIREMENTS

S1. Surface Roughness

S1.1 Washers shall have a multidirectional lay with asurface roughness not exceeding 750 µin. in height includingany flaws in or on the surface.

S1.2 Burrs shall not exceed 0.01 in. in height.

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This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM Headquarters. Your comments will receive careful consideration at a meeting of the responsibletechnical committee, which you may attend. If you feel that your comments have not received a fair hearing you should make yourviews known to the ASTM Committee on Standards, at the address shown below.

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